"Who are the workers today?"
Translation:Chi sono gli operai oggi?
It's like a vs an. It's based on the following word. Below I list the articles as singular/plural: Lo/gli for words that start with z (lo zoo) or s and a consonant (lo squalo) L'/gli for masculine words that start with a vowel (gli animali) L'/le for feminine words that start with a vowel. (le uove)
If "lavoratrici" is feminine, why is does the plural end in "i" and not "e"?
Lavoratrice is feminine but lavoratore is masculine. Presumably as both singulars end in "e", both plurals end in "i". Just another exception to the rule. Operaio/a follows the standard rule so an easier choice to learn first.